Method and device for primary frequency regulation based on bang-bang control

Abstract

The present invention provides a method and a device for primary frequency regulation based on bang-bang control, the method comprises: obtaining in real-time a power grid frequency of a steam turbine generator set; performing a subtraction operation on a rated power grid frequency and said power grid frequency to generate a power grid frequency difference; performing a dead zone process on the power grid frequency difference according to a dead zone fixed value to generate a frequency difference; performing a frequency difference compensation operation on the frequency difference to generate a frequency difference compensation instruction; and combining an original primary frequency regulation output instruction with the frequency difference compensation instruction and outputting the result to a steam turbine speed regulation system when a selecting switch is 1.

Description

FIELD OF THE INVENTION[0001]The present invention relates to primary frequency regulation technology associated with power grid, and more particularly, to a method and a device for primary frequency regulation based on bang-bang control.BACKGROUND OF THE INVENTION[0002]Primary frequency regulation is an important means for frequency regulation of power grid. After the power grid frequency exceeds a preset dead zone, the steam turbine generator set releases boiler-stored heat via a fast-action regulating valve to change the mechanical work, to thereby change the mode of the active power.[0003]Generally, there are two factors that decide the primary frequency regulation performance of a generator set: one is frequency regulation energy storage, and the other is fast release. If the generator set has sufficient energy storage, the exclusive factor deciding the fastness criteria (such as response time, rising time, etc.) of primary frequency regulation of the generator set is for the ex...

AI Technical Summary

Benefits of technology

The present invention provides a way to improve the regulation performance of a generator set in the event of small changes in grid frequency. This is done by allowing for a secondary fast release of energy storage from the generator set, which helps to overcome any limitations in the mechanism that controls the generator set. The invention also allows for a prediction control of the generator set in response to changes in grid frequency, without requiring any additional equipment or safety concerns. The invention is easy to use and can be quickly integrated into existing control platforms for generator sets, making it a popular option for use in power generation systems.

Problems solved by technology

Although the primary frequency regulation function of a generator set is achieved in the typical designs shown in FIGS. 1 and 2, when the grid frequency slightly fluctuates, energy storage of the generator set usually cannot be effectively released because the action of the executor is extremely small or because there is dead zone of the action, and the design and assessment criteria of primary frequency regulation hence cannot be achieved, the typical solution fails to take into consideration the influence of slight fluctuation of the grid frequency against the realization of the primary frequency regulation function of the generator set.

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